week 5 traditional approach and developing event table

In week 5, we were talking about SDLC in traditional approach. The data flow diagram is vital in the traditional approach. But it seems that system analysts do not like it. The main reason is DFD view the business process as a set and mechanistic hierarchy. Today, more and more business are becoming dynamic so that DFD can not define all business well.

I have tried to draw an level-0 DFD for an online sales system.

I also discussed event tables with my classmates. I found that most people were trying to add lots of events into the event table. Somebody's event table has more than 40 rows! I think it is good to view a system from different angles. But they are too ambicious. We are beginners and we are going to draw user case diagram and write user case narratives. It is just too complex if we add every thing into one system. Thus, I modified my event table and followed "CRUD". It is a very logic way to include all important events although it is not very flexiable.